Measuring and testing – Illuminating fluid
Reexamination Certificate
2004-03-29
2008-10-21
Allen, Andre J. (Department: 2855)
Measuring and testing
Illuminating fluid
C073S037000, C073S715000, C073S716000
Reexamination Certificate
active
07437910
ABSTRACT:
An object of the invention is to provide a pressure differentiator capable of improving measurement accuracy.The pressure differentiator of the invention includes an isothermal pressure vessel1,a narrow tube3for connecting an object to be measured to the inside of the vessel1,and a differential manometer2for calculating a differential pressure between the object and the inside of the vessel1.It is preferable that a flow through the narrow tube3during measurement is a laminar flow. The isothermal pressure vessel1is fitted with a temperature equalizing material. As the temperature equalizing material, thin metal wires may be used. When the pressure Psto be measured within a vessel positioned below is changed, the pressure Pcwithin the isothermal pressure vessel1is changed, with a slight lag, through the narrow tube3.By measuring the differential pressure Pj(=Ps−Pc) at that time, using a diaphragm-type pressure differentiator, the derivative value of the pressure Psmay be calculated.
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Patent Abstracts Of Japan—Publication No. 02-256122 “Impact Pressure Relay”, Mitsubishi Electric Corp.
Kagawa Toshiharu
Kawashima Kenji
Allen Andre J.
Jenkins Jermaine
Millen White Zelano & Branigan P.C.
Tokyo Institute of Technology
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